Unable to create API/PO after importing OFX File. 

Error: Conversion from type "DBNull to type "String" is not valid. Rolling back transaction while create API/PO from Credit Card Statement form.

Solution:
For OFX Import to successfully create an API or ENC document, please verify the following:

1. The SEND TO employee must belong to a workflow as a requester for TYPE API (AP Invoice) or ENC (Purchase Order)
   

1. Credit Card Setup must include a vendor ID and Distribution code